Investors didn't need to wait long to
earn abnormal returns from stocks deleted from the index.
An investment strategy of «long carbon - efficient firms and short carbon - inefficient firms» would
earn abnormal returns of 3.5 % -5.4 % per year.
Because technical analysis uses price and volume information, all three levels of efficiency state that an investor would be unable to
earn an abnormal return with this information.
Meaning that if you researched a company based on public information, you would be unable to
earn an abnormal return.
People who believe that they can
earn an abnormal return by researching companies will argue that the market is weak form efficient.
Not exact matches
In summary, some individual investors / traders do consistently
earn economically significant
abnormal returns.
Individuals in the top 10 % of past performers
earn average
abnormal (adjusted for size and momentum effects) monthly
returns starting at 7.85 % after one month and falling gradually to 5.20 % after 36 months.
An investor selecting a portfolio according to the percentage of contributions given to the winner in a presidential election would have
earned significant
abnormal returns of up to 6.6 % per year during the first year after an election.
A recent study conducted by April Klein and Emanuel Zur on shareholder activism found that stock prices of companies targeted by activist investors
earn 10.2 % average
returns during the period surrounding an activist's ownership disclosure and an additional 11.4 %
abnormal return during the following year.
Turning to the U.S., a study by Coval and Moscowitz found that mutual fund managers «
earn substantial
abnormal returns in nearby investments,» suggesting that «investors trade local securities at an informational advantage.»
Specifically, hedge fund targets
earn 10.2 % average
abnormal stock
returns during the period surrounding the initial Schedule 13D.
Instead, hedge fund targets
earn an additional 11.4 %
abnormal return during the subsequent year, and other activist targets realize a 17.8 %
abnormal return over the year following the activists» interventions.